Sound scattering by cylinders of noncircular cross section
DiPerna, Daniel T.
MetadataShow full item record
This thesis investigates a new method for predicting the farfield scattered pressure of a plane wave due to an infinite cylinder of noncircular cross section. Both impenetrable and penetrable :fluid boundary condi tions will be treated for several types of cross sections and for a large frequency range. This new method requires the conformal mapping of both the exterior and interior of a closed surface to a semi-infinite strip. Numerically efficient algorithms wi ll be presented for both of these cases. A new method for satisfying the boundary conditions will be developed, as well as an efficient algorithm for generating the required modal functions on the boundary. Numerical results are presented for cross sections in the shape of an ellipse, square, and three leaf clover. In all cases, the results compare extremely well with exact or high frequency asymptotic results.
Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and Woods Hole Oceanographic Institution October 1993
Showing items related by title, author, creator and subject.
Distinctions in sound patterns of calls by killer whales (Orcinus Orca) from analysis of computer sound features Watkins, William A.; Daher, Mary Ann; DiMarzio, Nancy A.; Reppucci, Gina (Woods Hole Oceanographic Institution, 1998-03)Calls of killer whales, Orcinus orca, were analyzed using computed sound features to classify sound patterns and identify call similarties. Calls were classified and separated according to the podfamily group within clans ...
Loewen, Mark Richard (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1991-12)Breaking waves dissipate energy, transfer momentum from the wind to surface currents and breaking enhances the transfer of gas and mass across the air-sea interface. Breaking waves are believed to be the dominant source ...
An inverse method for obtaining the attenuation profile and small variations in the sound speed and density profiles of the ocean bottom Rajan, Subramaniam D. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1985-05)The acoustic properties of marine sediments have a direct effect on the propagation of sound in the ocean. In the frequency range of interest (50 - 500 Hz) the sediment can be modelled as a fluid. Assuming horizontal ...